I've given SproutCore at least 3 chances over the last year. I like it better than Cappuccino, but it's just so buggy. UKI for life, though. It's not quite the same, but it's makin my day, day after day. <a href="http://ukijs.org/" rel="nofollow">http://ukijs.org/</a>
crashes instantly on my iphone4. the other sproutcore demos have worked, looked at them last night to evaluate whether to write an app in that instead of native.